SIRIUS 3RT1325-1AV60 — 4-pole power contactor, Size S0
The Siemens SIRIUS 3RT1325-1AV60 is a 4-pole power contactor in the Size S0 frame, with four normally-open main contacts and screw-type terminals for the main current circuit. Its AC-2 motor-switching rating is 7.5 kW at 400 V — that is the figure that governs real motor duty, not the higher AC-1 resistive current. For a 4-pole contactor this frame size, the AC-2 rating tells you the contactor is designed for slip-ring motor starting, where the inrush and breaking duty are heavier than a standard squirrel-cage start. Mounts via screw or snap-on onto a 35 mm DIN rail per DIN EN 50022, so it drops into any standard panel rail without adapters. The 61 mm width and 85 mm height keep it within the S0 footprint — plan side clearance of 6 mm for heat dissipation between units. Operating temperature range is -25 to +60 °C, with a maximum operating altitude of 2 000 m. The front face carries an IP20 finger-safe rating; the terminal area is IP00, so the wiring zone must be inside an enclosure or guarded.
Auxiliary contact ratings and coordination
The auxiliary contact block (integrated in this variant) is rated across common control voltages: 10 A at 24 V, 6 A at 230 V, 2 A at 60 V, 1 A at 110 V, 0.3 A at 220 V, and 3 A at 400 V. These are the make/break capacities for the control circuit — useful when selecting the contactor for a PLC output or a relay interposing. For short-circuit protection, type 1 coordination calls for a 63 A gL/gG fuse; type 2 coordination (where the contactor must remain usable after a fault) requires a 25 A gL/gG fuse. The mechanical life is typical 10 million operating cycles.
Lifecycle and sourcing
No official successor has been issued for this code, so the 3RT1325-1AV60 remains the direct fit for any panel built around the S0 frame with 4-pole, 4 NO main contacts and screw terminals.
Wiring and terminal data
Main circuit terminals accept solid or stranded conductors: 2x (1 to 2.5 mm²), 2x (2.5 to 6 mm²), or max 2x 10 mm². Auxiliary terminals accept 2x (0.5 to 1.5 mm²) solid, 2x (0.75 to 2.5 mm²) finely stranded with ferrule, or max 2x (0.75 to 4 mm²). AWG equivalents for main contacts are 2x (20 to 16), 2x (18 to 14), 1x 12; for auxiliary contacts the same AWG ranges apply.